Michael Brennan, DO
NPI 1689889388 · Endocrinology, Diabetes & Metabolism Physician · Saint Clair Shores, MI
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Brennan, DO is a Endocrinology, Diabetes & Metabolism Physician provider in Saint Clair Shores, MI (NPI 1689889388).
Provider details
- NPI number
- 1689889388
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 5101016966 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
5 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
445 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 154 | $79 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 134 | $120 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 82 | $175 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 22 | $128 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 22 | $17 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Empagliflozinbrand: Jardiance | 19 |
| Semaglutidebrand: Ozempic | 18 |
| Dapagliflozin Propanediolbrand: Farxiga | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$71,315 across 79 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (4)
- 17412 W 13 Mile RdBeverly Hills, MI 48025-5439Phone: (248) 258-8740
- 28050 Grand River AveFarmington Hills, MI 48336-5919Phone: (947) 521-8000
- 468 Cadieux RdGrosse Pointe, MI 48230-1507Phone: (313) 473-1000
- 1555 South Blvd E Ste 360Rochester Hills, MI 48307-5759Phone: (248) 258-8740
Registry dates
- Enumerated
- 2007-05-14
- Last updated
- 2024-08-21
- Certified
- 2024-08-21
Frequently asked questions
- What is Michael Brennan's NPI number?
- Michael Brennan's National Provider Identifier (NPI) is 1689889388, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Brennan's specialty?
- Michael Brennan is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Brennan located?
- Michael Brennan's practice location on file with NPPES is 23715 Little Mack Ave Ste 100, Saint Clair Shores, MI 48080-1181.
- What is Michael Brennan's phone number?
- The practice phone number listed in the NPPES registry for Michael Brennan is (586) 447-8021.
- Does Michael Brennan accept Medicare?
- Michael Brennan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Brennan's NPI active?
- Yes — Michael Brennan's NPI (1689889388) is active in the NPPES registry as of the last update on 2024-08-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.